Free icons are great resources for web designers as quality ones help creating beautiful outputs. But they are better when they come with the source files as it is possible to edit/improve them.
Smashing Magazine is sharing Flavour Extended icon set, a set of 450+ icons, that is created by Oliver Twardowski.
Icons are in 48*48px size & PNG format. PSD source files are also included.
The set contains icons of users, folders, file formats, actions, social bookmarking services & more.